On 3 January 1948, she appeared on the BBC radio programme Time for Verse, where she had already become a favourite for her voice: "a rich, expressive, finely modulated instrument.

)[10] Balcon starred opposite Stewart Granger in the film Saraband for Dead Lovers (1948), with Jean Kent in Good Time Girl (1948), and The Lost People (1950).

Her father was deeply unhappy about the affair and Balcon being named publicly as co-respondent in Day-Lewis' divorce, and cut her off.

[10] Cecil Day-Lewis and Jill Balcon shared a great love for poetry and performed together in many public readings.

After the children were born, Balcon concentrated on acting in radio and TV productions in order to have more manageable schedules.